2020 Tech Report Jan-Feb

Task # 2.c.: Cleaning a Strainer in an Alternate Control Group Configuration: No Drain Valves

ACTION

COMMENT

NOTE: If the possibility exists that the condi- tions may have been altered after prepara- tion of the plan, you must repeat Task # 1 “Preparing for Refrigeration System Strainer Cleaning.” Prepare a detailed plan, including written iso- lation and pump out procedures. Review the equipment’s corresponding SOP. Items to include: Valve numbers, Lockout / Ta- gout isolation points, special test pressure re- quirements, order of isolation, etc. Identify and verify locations for purging / vent- ing, attachment of pump down hoses, pres- sure gauges, etc. Check the manufacturer’s Operation and Maintenance Manuals for information or spe- cial instructions to be followed for isolation, testing and evacuation where applicable. NOTE: When performing this procedure, the prevention of hydrostatic lock is of extreme im- portance. The Refrigeration Operator / Tech- nician in charge of this procedure must field verify piping to ensure shutdown will not cre- ate safety or operational issues. NOTE: Refrigeration Operators / Technicians must follow the facility’s Lockout / Tagout Program. If you have any questions while performing this procedure, refer to the equip- ment’s corresponding SOP, consult the facility contact, or review the facility’s Ammonia Re- frigeration Compliance Program. If necessary, expand the area of isolation to include a section of piping that has a purge / drain valve available.

1.

Confirm that Task # 1 “Preparing for Re- frigeration System Strainer Cleaning” has been completed. If not completed, do so now before continuing with this Mainte- nance Procedure. Prepare a proper plan to pump out and shutdown the equipment that requires strainer cleaning.

2.

3.

Field verify the isolation procedures and isolation points for affected piping or sys- tems. Ensure shutdown will not affect other equipment in the system before continuing. Verify the isolation of other forms of en- ergy to the valves and equipment being worked on.

4.

5.

Close or confirm the purge / drain valve identified in the isolation procedure is closed. Carefully remove the plug or gauge from the purge / drain valve identified in the isolation procedure.

6.

RETA TECHNICAL REPORT PAGE 14